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HCPL-3700-320 Optoisolator Equivalent & Substitute Parts
Part Overview
The HCPL-3700-320 is a high-voltage optoisolator with Darlington output configuration, rated for 5000Vrms isolation voltage. This component is designed for applications requiring galvanic isolation with single-channel Darlington output capability. The main part is currently discontinued at DiGi Electronics, making substitute part identification essential for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Broadcom Limited |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Output Type | Darlington |
| Voltage - Output (Max) | 20V |
| Current - Output / Channel | 30mA |
| Turn On / Turn Off Time (Typ) | 4µs, 10µs |
| Rise / Fall Time (Typ) | 20µs, 0.3µs |
| Input Type | AC, DC |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-SMD, Gull Wing |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution eligibility for the HCPL-3700-320 is determined by strict equivalence across the following critical parameters:
- Isolation voltage rating: 5000Vrms
- Output configuration: Darlington topology
- Number of channels: 1
- Maximum output voltage: 20V
- Output current per channel: 30mA
- Switching timing characteristics: 4µs turn-on, 10µs turn-off
- Input signal type compatibility: AC and DC
- Operating temperature range: -40°C to 85°C
- Package type: 8-SMD Gull Wing
The HCPL-3700-320E qualifies as a direct substitute based on identical electrical specifications and mechanical packaging. The primary distinction is product status and compliance certification level.
Parameter Comparison
| Parameter | HCPL-3700-320 | HCPL-3700-320E |
|---|---|---|
| Manufacturer | Broadcom Limited | Broadcom Limited |
| Number of Channels | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms |
| Output Type | Darlington | Darlington |
| Voltage - Output (Max) | 20V | 20V |
| Current - Output / Channel | 30mA | 30mA |
| Turn On / Turn Off Time (Typ) | 4µs, 10µs | 4µs, 10µs |
| Rise / Fall Time (Typ) | 20µs, 0.3µs | 20µs, 0.3µs |
| Input Type | AC, DC | AC, DC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SMD, Gull Wing | 8-SMD, Gull Wing |
| Mounting Type | Surface Mount | Surface Mount |
| Product Status | Discontinued at DiGi Electronics | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging | Not specified | Tube |
Engineering Selection Recommendations
The HCPL-3700-320E is the direct functional equivalent of the HCPL-3700-320. Both parts share identical electrical and mechanical specifications across all critical parameters. The HCPL-3700-320E is preferred for new designs and ongoing procurement due to its active product status and ROHS3 compliance certification. The original HCPL-3700-320 is discontinued and should be replaced with the HCPL-3700-320E in applications where component availability and regulatory compliance are requirements.
Frequently Asked Questions (FAQ)
Q: Can HCPL-3700-320E be used as a direct replacement for HCPL-3700-320?
A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including isolation voltage, output current, switching timing, and package configuration.
Q: What is the difference between HCPL-3700-320 and HCPL-3700-320E?
A: The primary differences are product status and compliance. HCPL-3700-320 is discontinued, while HCPL-3700-320E is active. HCPL-3700-320E carries ROHS3 compliance certification, whereas the original part is RoHS non-compliant. Packaging for HCPL-3700-320E is specified as Tube.
Q: Are there any package or mounting differences?
A: Both parts use identical 8-SMD Gull Wing surface mount packaging. No PCB layout or assembly process modifications are required when substituting between these parts.
Q: What isolation voltage does this optoisolator provide?
A: Both the HCPL-3700-320 and HCPL-3700-320E provide 5000Vrms isolation voltage with single-channel Darlington output configuration.
Q: What is the maximum output current rating?
A: The maximum output current per channel is 30mA for both parts.
Q: What input signal types are supported?
A: Both parts accept AC and DC input signals.
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